Looks like an Olympia SM9 font. (:
Hmmm . . . any chance it could be a Remington Rand Model 17? I ask because I think I know who sent it and am pretty sure the RemRand is the only machine in that house!
I am not that good at knowing what font from what brand, but I have some Hermes machines, an Olympia, a Facit, some Smith-Coronas and quickly becoming my almost favorite typewriter an Adler J4 that can all do cards. I do not think it would be to difficult in any machine if the bail rollers were adjusted to hold the card. Your post has raised my curiosity. I need to try cards in my oldest machines without card guides and such.
Bill, let me know what you discover. I remember typing postcards on my Dad's old desktop Underwood, but none of my portables seem to be able to hand the thicker cardstocks.
I run index cards through my portables, but I think they're also meant for that sort of thing. Not sure if a postcard is thicker than an index card, but if you have guides, or paper "fingers" to curl it up, you might be able to feed one through.
This particular postcard is thicker than an index card - and, surprisingly, shows no sign of having been curled around a platen. Am wondering if the sender had access to a Selectric or something similar.